Signments



(ModeL) O. E. SGRIBNER.

CIRCUIT FOR TELEPHONE ,EXGHANGES. No. 278,367. Patented May-29,1883.

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. UNITED STATES l PATENT O F CE.

CHARLES E. SGRIBNER, OF oHioAeo, ILLINOIS, ASSIGNOR, BY MESNE AS.- SIGNMENTS, TO THE WESTERNELEOTRIG COMPANY, oFsAME PLACE.

CIRCUIT Fen TELEPHONEI-EXCHANGES.

SPECIFICATION forming part of Letters Patent No. 278,367, dated May 29, 1883.

Application filed November 6, 1880. (Model.)

To all whom it may concern Be itknown that I, CHARLES E. SGRIBNER, a citizen of the United States, residing at Ohioago, in the county of Cook and State of Illinois, have discovered certain new and useful Improvements in Oircuits'for Telephone-Exchanges, of which the following is a full,

, clear, concise, and exact description, reference heinghad to theaccompanyingdrawings,formin g a partot' this specification.

My invention relates to a telephone exchan ge system.

.Inthe drawings, l igurel represents a side elevation, andjFig. 2 a front elevation, of an annunciator at the central office. Fig. 3 rep resents a modification of the annunciator. Each subscriber is provided with an aununciator. i it Similar parts are represented by like letters of reference.

(A isthcbase, a the drop, and a! the magnet. 1) is the armature-lever, which is provided with a catch, 1), and pivoted at 12 G is a metallic spring provided with contact-points 0 and a, the latter normally resting against the shutter. Contact-point 0 is placed opposite to point 1). Points D of all annunciators of thesystem, or as many as it may be convenient to group together, are connected with a common line, which passes through an opcrators telephone and to ground, as shown.

In the modification, Fig. the spring 0 is not used, and the shutter itself becomes the switch. The subscriber thus is enabled toinform the listening attendant what connection he wishes.

An indicating annunciator drop and an electro-magnet and its armature for actuating the same, in combination with. a switch auto-,

matically actuated by the movement of said drop, which acts to divert the circuit extending from the signaling-station from. the said electro magnet to a normally-open earth-circuit containing a receiving-instrument.

' CHARLES E. SGRIBNER.

Witnesses:

GEORGE P. BARTON, JAMES L. BAIRD. 

